- #1
tomboi03
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Let X and X' denote a single set in the two topologies T and T', respectively. Let i:X'-> X be the identity function
a. Show that i is continuous <=> T' is finer than T.
b. Show that i is a homeomorphism <=> T'=T
This is all I've got.
According to the first statement... X [tex]\subset[/tex] T and X' [tex]\subset[/tex] T
a. if i is continuous... each open subset V of X' the set i^-1 is an open subset of X
T' is finer than T means... T [tex]\subset[/tex] T'.
i don't know where to go from here...
b. if i is a homeomorphism...
then... i is... a bijection therefore the function and the inverse function are continuous.
i and i^-1 are continuous. each open subset V of X' the set i^-1 is an open subset of X
if T' = T... then...
i don't know where to go from here either...
can someone help me out?
Thank You,
tomboi03
a. Show that i is continuous <=> T' is finer than T.
b. Show that i is a homeomorphism <=> T'=T
This is all I've got.
According to the first statement... X [tex]\subset[/tex] T and X' [tex]\subset[/tex] T
a. if i is continuous... each open subset V of X' the set i^-1 is an open subset of X
T' is finer than T means... T [tex]\subset[/tex] T'.
i don't know where to go from here...
b. if i is a homeomorphism...
then... i is... a bijection therefore the function and the inverse function are continuous.
i and i^-1 are continuous. each open subset V of X' the set i^-1 is an open subset of X
if T' = T... then...
i don't know where to go from here either...
can someone help me out?
Thank You,
tomboi03